Lower Iron Creek Culvert Replacement

Salmonid Habitat Restoration and Acquisition

Fish Passage Improvement
Project ID053 08 SA
Recovery DomainsSnake River
Start Date12/01/2009
End Date12/31/2010
Last Edited05/08/2024
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The corrugated 41 foot metal culvert on Iron Creek was replaced with a 26 x 35 HS-modular vehicle bridge (DV-VM Bridge).The project was a cooperative effort with the Upper Salmon Basin Watershed Program, the Lemhi Soil and Water Conservation District and Lemhi County Road and Bridge Department. The project implementation was delayed in September 2009 when Idaho Department of Fish and Game Fisheries Biologists documented the presence of ESA-listed Chinook salmon spawning immediately above and below the project site. The presence of Chinook near the project site required revision of the Biological Assessment and the timeline for implementation was changed to summer of 2010.
Extended high flows in Iron Creek during the construction work window resulted in complications with sedimentation release during the dewatering phase of the project.
The replacement of the existing culvert with a bridge resulted in a free-flowing Iron Creek and the elimination of a velocity barrier for certain life stages of anadromous and resident fish. This action resulted in an additional four miles of stream access for ESA-listed fish.

Project Benefit    

Iron Creek is designated as critical habitat and essential fish habitat for Snake River spring/summer ESU Chinook salmon, as well as proposed critical habitat for Columbia River Steelhead trout. The proposed action would allow upstream passage to five miles of high quality spawning and rearing habitat for all life-stages of ESA-listed and resident fish species. This project will also complement the Iron Creek Reconnection project number 019 04 A funded by the 2004 PCSRF grant


Metric Completed Originally
Fish Passage
  Barriers Removed
  Miles Opened 4.00 4.00

Funding Details

In-Kind Other$43,318
Report Total:$96,558

Project Map


Lower Iron Creek Culver    

  • Worksite Identifier: Lower Iron Creek Culver
  • Start Date: 03/15/2010
  • End Date: 08/11/2010
Area Description

No Area Description data was found for this worksite.

Location Information

  • Basin: Salmon (170602)
  • Subbasin:
  • Watershed: 1706020302
  • Subwatershed:
  • State: Idaho
  • Recovery Domain: Snake River
  • Latitude: 44.887985448
  • Longitude: -113.971481323


  • Snake River Spring/Summer-run Chinook Salmon ESU
  • Snake River Basin Steelhead DPS




  • C.0 Salmonid Habitat Restoration and AcquisitionY (Y/N)
    •      . . C.0.a Habitat restoration and acquisition funding 96,558.00
    •      . . C.0.b Length of stream treated/protected .02
    •      . . C.0.c
      Project identified in a Plan or Watershed Assessment
      Wendy Koons, PCSRF Planning and Technical Assistance , Project number 051 04 SA S3, Upper Salmon Basin Watershed Program, 955 Riverfront Drive, Ste B, Salmon, Idaho 83467
    •      . . C.0.d.1 Project Monitoring (LOV)
    •      . . C.0.d.2 Monitoring Location (LOV)
    •      . . C.0.d.3
      Monitoring text (from Phase I)
      Monitoring points were established prior to project construction by the Upper Salmon Basin Watershed Project staff. Monitoring will be folllowed up within one year of implementation to evaluate the effectiveness of the practice and verify that structures are functioning as intended by the county/landowner. Additional photo-point and visual inspections will occur at 5-year intervals for the life of the county/landowner contract with the Lemhi Soil and Water Conservation District, i.e., a period of 15 years. Monitoring data is and will be collected according to the USBWP monitoring plan.
    •      . . C.2 Fish Passage ImprovementY (Y/N)
      •      . . . . C.2.a Fish Passage Funding 96,558.00
      •      . . . . C.2.b.1 Length of stream made accessible 4.00
      •      . . . . C.2.b.3 Type of blockage/barrier (LOV)
      •      . . . . C.2.b.4 Number of blockages/impediments/barriers impeding passage 1
      •      . . . . C.2.g.1 Bridge installed or improved at road stream crossingY (Y/N)
        •      . . . . . . C.2.g.2 Number of bridges installed or improved/upgraded 1
        •      . . . . . . C.2.g.3 Miles of stream made accessible by bridge installation or improvement/upgrade 4.00